CN111048035A - Display screen driving method, driving circuit and display screen - Google Patents
Display screen driving method, driving circuit and display screen Download PDFInfo
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- CN111048035A CN111048035A CN202010003387.1A CN202010003387A CN111048035A CN 111048035 A CN111048035 A CN 111048035A CN 202010003387 A CN202010003387 A CN 202010003387A CN 111048035 A CN111048035 A CN 111048035A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000011324 bead Substances 0.000 claims abstract description 139
- 230000015654 memory Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a display screen driving method, a display screen driving circuit and a display screen. Wherein, the method comprises the following steps: when the display screen is in a closed state, the lamp beads of the display screen are powered according to preset voltage, wherein the preset voltage is smaller than the working voltage of the lamp beads. The invention solves the technical problem that the display screen is easy to be wet to cause the failure of the display screen under the condition of long-time non-use in the prior art.
Description
Technical Field
The invention relates to the field of displays, in particular to a display screen driving method, a display screen driving circuit and a display screen.
Background
At present, a control circuit inside an LED display driving constant current chip is usually designed according to normal light emission of an LED, and the minimum value of a constant current is usually milliampere IV which is more than or equal to 0.5 mA. However, as the application of the LED display screen is more and more extensive, the unit pixel density of the LED display screen is higher and higher, the LED lamp beads are smaller and smaller, and the small-sized lamp tube leads the packaging material of the chip to be more and more easily affected with damp.
The LED lamp bead has the advantages that an effective solution is not provided at present aiming at the problem that LED lamp beads are prone to being wetted and break down when an LED display screen is not used for a long time in the prior art.
Disclosure of Invention
The embodiment of the invention provides a display screen, a driving method and a driving circuit thereof, and aims to at least solve the technical problem that LED lamp beads are easy to be wet to cause faults when an LED display screen is not used for a long time in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a driving method of a display panel, including: when the display screen is in a closed state, the lamp beads of the display screen are powered according to preset voltage, wherein the preset voltage is smaller than the working voltage of the lamp beads.
Further, before the lamp beads of the display screen are powered according to the preset voltage, the duration that the display screen is continuously in the closed state is detected; and under the condition that the duration is longer than the preset duration, the step of supplying power to the lamp beads of the display screen according to the preset voltage is carried out.
Further, the method further comprises: when the display screen is in a closed state, acquiring humidity information of the environment where the display screen is located; determining a power supply parameter for supplying power to the lamp bead according to the humidity information, wherein the power supply parameter comprises at least one of the following items: power supply cycle and power supply duration; and supplying power to the lamp beads of the display screen according to the preset voltage and the power supply parameters.
Further, provide preset voltage to the lamp pearl in the display screen, include: and controlling a switch to be switched on to provide a power supply channel with preset voltage for the lamp bead so as to supply power for the lamp bead according to the preset voltage.
Further, supply power for the lamp pearl according to predetermineeing voltage, still include: determining a currently required target preset voltage; and controlling a power supply electronic channel corresponding to the target preset voltage in the power supply channel to be switched on so as to supply power to the lamp bead according to the target preset voltage.
Further, still include for the lamp pearl power supply of display screen according to preset voltage: determining a currently required target preset voltage; and outputting the target preset voltage to the driving controller to control the driving controller to output the target preset voltage to the lamp bead.
Further, determining a currently required target preset voltage includes: acquiring humidity information of an environment where a display screen is located; and determining a target preset voltage according to the humidity information.
Further, when the display screen is in a closed state, the method further includes: the frame frequency of the display screen is reduced.
Further, the display screen is supplied with power by the power grid, and in the process of supplying power to the lamp beads of the display screen according to the preset voltage, the method further comprises the following steps: detecting whether the display screen is disconnected with a power grid or not; and if the display screen is disconnected with the power grid, controlling the display screen to be switched to be supplied with power by the battery.
According to an aspect of an embodiment of the present invention, there is provided a driving circuit of a display panel, including: the lamp beads are electrically connected with the power supply channels through the first power supply channels, the second power supply channels are electrically connected with the power supply channels through the second power supply channels, and the power supply channels are electrically connected with the power supply channels; the switch is arranged between one pole of at least one lamp bead of the display screen and the plurality of power supply channels; and the controller is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the lamp beads.
Further, the controller includes: the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel; and the driving controller is used for controlling the power supply voltages of the plurality of power supply channels.
Further, the second power supply channel includes: and each power supply sub-channel corresponds to different preset voltage.
And furthermore, the second power supply channel is a power supply channel, the drive controller is also connected with the control register, the control register outputs the current required target preset voltage to the drive controller, and the drive controller supplies power to the lamp beads through the second power supply channel according to the target preset voltage.
Furthermore, the driving circuit further comprises a timer, the timer is further used for recording the time length of the display screen in the closed state, and the control register is further used for controlling the switch to select the second power supply channel under the condition that the time length is greater than the preset time length.
Further, the control register is also used to determine whether the display screen is in an off state by detecting whether the main memory of the display screen is refreshed.
Further, the current that second power supply channel provided for the lamp pearl is 0.1 ~ 0.4 uA.
Furthermore, a plurality of electron supply channels are three electron supply channels, and the current that three electron supply channels provided for the lamp pearl is 0.1uA, 0.2uA and 0.3uA respectively.
Further, the preset voltage corresponding to the red chip of the lamp bead is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
Further, the preset voltage corresponding to the green chip of the lamp bead is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
Further, the preset voltage corresponding to the blue chip of the lamp bead is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
According to an aspect of an embodiment of the present invention, there is provided a driving method of a display panel, including: when the display screen is in a closed state, the display module of the display screen is supplied with power according to a preset voltage, wherein the preset voltage is smaller than the working voltage of the display module.
According to an aspect of the embodiment of the present invention, a display screen is provided, where the display screen includes a plurality of display modules, and the display modules of the display screen are powered by a preset voltage when the display screen is in an off state, where the preset voltage is less than an operating voltage of the display modules.
In the embodiment of the invention, when the display screen is in the off state, the lamp beads of the display screen are supplied with power according to the preset voltage, wherein the preset voltage is less than the working voltage of the lamp beads. Above-mentioned scheme is through providing power for the lamp pearl according to the voltage of predetermineeing that is less than operating voltage for the lamp pearl under the condition that the display screen was closed to can make the lamp pearl generate heat through weak electric current when not lightening the lamp pearl, and then reach damp-proofing effect through generating heat of lamp pearl, solved among the prior art LED display screen and wet the technical problem that leads to LED lamp pearl to break down easily under the condition of not using for a long time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an alternative driver circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an alternative driver circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present application; and
fig. 5 is a flowchart of a driving method of a display panel according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for driving a display screen, where the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present application, as shown in fig. 1, the method includes the following steps:
and S102, supplying power to the lamp beads of the display screen according to a preset voltage when the display screen is in a closed state, wherein the preset voltage is less than the working voltage of the lamp beads.
When the display screen is in a closed state, no power consumption exists, the display screen is connected with a power supply but does not display pictures, the display screen is not bright, and due to the fact that a RAM (Random Access Memory) is arranged on a control card of the display screen and used for directly exchanging data with a control chip on the control card of the display screen to control the display screen to display images, data of all the RAMs (Random Access memories) in the display screen are not refreshed any more when the display screen is in the closed state. When the data of all the RAMs in the display screen are not refreshed any more, the check bits in the RAMs are designated data, and therefore when the check bits read by the control register into the RAMs are designated data, the data of all the RAMs in the display screen are determined not to be refreshed any more, and the display screen is in a closed state.
The operating voltage of lamp pearl is used for showing and can make the lamp pearl light and the normal luminous voltage, and above-mentioned preset voltage is less than operating voltage, and preset voltage is not enough to drive the lamp pearl and light, and the lamp pearl does not give out light under preset voltage.
After the preset voltage is provided for the lamp beads, the current corresponding to the preset voltage can be generated, the lamp beads are difficult to light due to the fact that the preset voltage is smaller than the working voltage of the lamp beads, correspondingly, the current generated by the preset voltage is weak, and the current for starting the lamp beads is difficult to start.
It should be noted that the lamp beads of the present embodiment may be all lamp beads of the display screen, or may be some of the lamp beads. The power supply for the lamp beads of the display screen according to the preset voltage can be realized by uniformly supplying power for lamp bead modules comprising all the lamp beads, or can be realized by respectively supplying power for different lamp bead sub-modules, and the preset voltage for supplying power for each lamp bead sub-module can be the same or different; the lamp beads of the display screen can be powered by preset voltage, or single lamp beads can be powered by the preset voltage, and the preset voltage of each lamp bead can be the same or different.
The preset voltage is less than the working voltage of the lamp bead, so that when the lamp bead is powered according to the preset voltage, the lamp bead is not driven to emit light, and meanwhile, the preset voltage is converted into micro heat energy inside the lamp bead, so that the lamp bead is enabled not to be damped. Because predetermine the voltage and can not light the lamp pearl, nevertheless can make the lamp pearl give off the heat, when predetermineeing the voltage promptly, the lamp pearl is luminous not, only produces the heat, therefore can play dampproofing effect. And when playing dampproofing effect, because it is less to predetermine the voltage, be not enough to drive the lamp pearl luminous, consequently can not consume too high power.
By last knowing, this application above-mentioned embodiment is in the off-state at the display screen, and the lamp pearl power supply for the display screen according to preset voltage, wherein, preset voltage is less than the operating voltage of lamp pearl. Above-mentioned scheme is through providing power for the lamp pearl according to the voltage of predetermineeing that is less than operating voltage for the lamp pearl under the condition that the display screen was closed to can make the lamp pearl generate heat through weak electric current when not lightening the lamp pearl, and then reach damp-proofing effect through generating heat of lamp pearl, solved among the prior art LED display screen and wet the technical problem that leads to LED lamp pearl to break down easily under the condition of not using for a long time.
As an optional embodiment, before supplying power to the lamp bead of the display screen according to the preset voltage, the method further includes: detecting the duration of the display screen in the closed state continuously; and under the condition that the duration is longer than the preset duration, the step of supplying power to the lamp beads of the display screen according to the preset voltage is carried out.
In the above steps, the duration of the display screen in the closed state is detected.
When the display screen is in the off state, the time length is longer than the preset time length, which indicates that the time length when the lamp bead of the display screen is not started is up to the preset time length, so that the lamp bead is easily affected by the environmental humidity, and is affected by damp. Under this kind of condition, supply power for the lamp pearl according to predetermineeing voltage to make the lamp pearl can generate heat, and then play damp-proof effect.
In an alternative embodiment, whether the display screen is turned on or not may be determined by detecting whether the data in the RAM of the display screen is refreshed, and if the data in the RAM of the display screen is not refreshed, the display screen is determined to be in an off state and not turned on, and if the data in the RAM of the display screen is refreshed, the display screen is turned on. The display screen can be provided with a timer, the timer starts timing after the display screen is closed, the display screen keeps timing when being in a closed state, and the timing is stopped when the display screen is opened so as to obtain the duration of the display screen when being in the closed state.
In another alternative embodiment, whether the display screen is powered off may be determined by detecting whether a power-off key of the display screen is triggered, and when the power-off key is detected to be triggered, it is determined that the display screen enters a power-off state.
It should be noted that the power supply of the display screen can be switched, but the switching of the power supply does not affect the timing of the duration of the display screen being in the off state. For example, the display screen is connected to a 220V power grid when not powered off, and is connected to a backup battery in case of power off. The display screen is not powered off after being closed, the timer starts timing after the display screen is closed, at a certain moment after the display screen is closed, the worker powers off the display screen, the display screen is switched to be powered by the battery, however, as long as the display screen is not restarted, namely, the lamp beads of the display screen are not lightened again, the timer does not interrupt or count again, but continues timing.
As an alternative embodiment, the method further includes: when the display screen is in a closed state, acquiring humidity information of the environment where the display screen is located; determining a power supply parameter for supplying power to the lamp bead according to the humidity information, wherein the power supply parameter comprises at least one of the following items: power supply cycle and power supply duration; and supplying power to the lamp beads of the display screen according to the preset voltage and the power supply parameters.
Specifically, the power supply period is used to indicate the time between two power supplies, and the power supply duration is used to indicate the duration of each power supply.
The display screen has various modes of acquiring humidity information, for example, the humidity information can be acquired from a network end through the communication module, or a humidity sensor can be directly arranged in the display screen and acquired from the humidity sensor. The present application is not particularly limited.
Because the geographical positions of the display screens are different, the environments are also different, and therefore, if the same set of power supply parameters is set for all the display screens, the requirements of the display screens in different geographical positions are difficult to meet. In the case of a high ambient humidity, a short power supply period and a long power supply time are required, and in the case of a high ambient humidity, a long power supply period and a short power supply time are required.
Taking the display screen arranged in a school as an example, the display screen can be closed for a long time during the summer vacation period of the school, and the scheme can be used for preventing moisture of the display screen. If the summer holiday is a period when the local rainy weather causes dampness, the power supply period can be set to be once every 24 hours, and the power supply time is 2 hours. And if the climate is dry during summer holiday, the equipment can be powered every 72 hours for 2 hours.
The purpose of the above scheme is to improve the dehumidification effect of the display screen lamp bead under the condition of great environment humidity, ensure the drying of the lamp bead as far as possible, and when the environment humidity is less, reduce the power consumption of the display screen as far as possible under the condition of ensuring the moisture-proof effect.
In an optional embodiment, a correspondence table between different humidities and power supply parameters may be set, the correspondence table is stored in the control register, and the control register searches for the power supply parameter matched with the current ambient humidity according to the correspondence table, so as to supply power to the lamp bead according to the searched power supply parameter.
As an optional embodiment, providing a preset voltage to a lamp bead in a display screen includes: and controlling a switch to be switched on to provide a power supply channel with preset voltage for the lamp bead so as to supply power for the lamp bead according to the preset voltage.
In the above scheme, can provide a dampproofing power supply channel different with the power supply channel of normal work for the display screen, this dampproofing power supply channel is the power supply channel that the lamp pearl provided default voltage promptly to switch between two power supply channels through a switch, when the display screen needs normal work, insert the power supply channel of normal work with the lamp pearl through the switch, and when the display screen needs dampproofing, insert dampproofing power supply channel can with the lamp pearl through the switch.
In an alternative embodiment, the switches may be controlled by control registers in the driving circuitry of the display screen.
As an optional embodiment, providing power to the lamp bead according to the preset voltage further comprises: determining a currently required target preset voltage; and controlling a power supply electronic channel corresponding to the target preset voltage in the power supply channel to be switched on so as to supply power to the lamp bead according to the target preset voltage.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, the power supply channel for providing the damp-proof preset voltage for the lamp bead comprises a plurality of power supply channels, and each power supply channel corresponds to different preset voltages, so that different sub power supply channels can be selected according to the currently required target preset voltage.
In an alternative embodiment, fig. 2 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the scheme is described with reference to fig. 2 in this example by using a connection manner in which a lamp bead is a common anode. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for being connected into different contacts through control, so that the lamp beads are connected into different power supply channels. The power supply channel comprises a working channel and a micro current channel 1, a micro current channel 2 and a micro current channel 3 (namely the plurality of sub power supply channels are described by taking three sub power supply channels as an example in the embodiment), the switch is controlled by the control register, the working channel is accessed when the display screen normally works, the constant current selection driving controller provides working voltage corresponding to the lamp beads for the lamp beads, when the display screen enters a damp-proof mode, the control register determines target preset voltage according to the environment humidity, and the control switch is accessed into at least one of the three micro current channels according to the target preset voltage.
To be more specific, for example, the preset voltage corresponding to the micro current channel 1 is 0.1, the preset voltage corresponding to the micro current channel 2 is 0.4, and the preset voltage corresponding to the micro current channel 3 is 0.7. If the preset target voltage determined by the control register according to the current humidity is 0.4, the control register is connected to the micro-current channel 2 to provide corresponding voltage for the lamp beads.
As an optional embodiment, the lamp pearl power supply for the display screen according to preset voltage still includes: determining a currently required target preset voltage; and outputting the target preset voltage to the driving controller to control the driving controller to output the target preset voltage to the lamp bead.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, only one power supply channel for providing damp-proof preset voltage for the lamp bead is provided, but the preset voltage output by the power supply channel can be continuously controlled through the control register, namely, the power supply channel can output different preset voltages, so that the driving controller can be controlled to output the corresponding target preset voltage according to the current required target preset voltage.
In an alternative embodiment, fig. 3 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the example still uses a connection mode in which a lamp bead is a common anode to describe the above scheme with reference to fig. 3. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for accessing different contacts, so that the lamp beads are accessed into different power supply channels. The power supply channel comprises a working channel and a current-converting micro-current channel (namely the power supply channel for providing the preset voltage), the switch receives control of the control register, the switch is connected into the working channel when the display screen normally works, the constant-current selective drive controller provides the working voltage corresponding to the lamp bead for the lamp bead, the current-converting micro-current channel is connected into the display screen when the display screen enters a damp-proof mode, the control register determines target preset voltage according to environment humidity and outputs the target preset voltage to the constant-current selective drive controller, and the constant-current selective drive controller outputs the corresponding voltage to the lamp bead.
For example, if the preset target voltage determined by the control register according to the current humidity is 0.4, the control switch is connected to the variable current micro-current channel and outputs the determined target preset voltage to the constant current selection drive controller, and the constant current selection drive controller can supply power to the lamp bead according to the target preset voltage.
As an alternative embodiment, determining the currently required target preset voltage includes: acquiring humidity information of an environment where a display screen is located; and determining a target preset voltage according to the humidity information.
In an alternative embodiment, a correspondence table between the humidity information and the target preset voltage may be stored in the control register, so that the control register can determine the currently required target preset voltage according to the correspondence table and the obtained current humidity information.
According to the scheme, the voltage can be preset for the corresponding target matched with the current environment humidity, so that the power consumption of the display screen can be reduced as much as possible while the moisture-proof effect is ensured.
As an alternative embodiment, when the display screen is in the closed state, the method further includes: the frame frequency of the display screen is reduced. In specific implementation, the frame frequency of the display screen may be modified by a self-contained counter, or may be modified in other ways, which is not limited in this embodiment.
When the line scanning is carried out on the display screen, because the lamp pearl of last line can have the residue of an equal degree, consequently can increase reverse voltage to the lamp pearl after scanning at every turn usually, prevent the influence of the visual effect of remaining to the display screen of lamp pearl, nevertheless increase reverse voltage to the lamp pearl, can influence the life-span of lamp pearl to a certain extent.
The frame frequency of the display screen is reduced by the scheme, so that the scanning frequency of the display screen is reduced, the frequency of increasing reverse voltage to the lamp beads in unit time is reduced, and the influence on the service life of the lamp beads is reduced.
In an optional embodiment, the frame frequency of the display screen can reach 3840Hz under the normal working condition, and under the above moisture-proof mode of the application, the frame frequency can be reduced to 30Hz, 60Hz or 120Hz, so that the power consumed by the lamp beads is further reduced, especially under the condition that the display screen is powered by a battery, the service time of the battery can be prolonged, and the problem that the lamp beads in the display screen are wet due to the fact that the battery is exhausted and the power cannot be continuously supplied to the display screen is avoided.
As an optional embodiment, the display screen is powered by a power grid, and in the process of powering the lamp bead of the display screen according to the preset voltage, the method further includes: detecting whether the display screen is disconnected with a power grid or not; and if the display screen is disconnected with the power grid, controlling the display screen to be switched to be supplied with power by the battery.
In the scheme, the power supply of the display screen can be switched. For example, the display screen is connected to a 220V power grid when not powered off, and is connected to a backup battery in case of power off.
Switch to battery powered under the circumstances with electric wire netting disconnection through setting up the display screen to can guarantee all to possess the power constantly and supply power for the lamp pearl of display screen, and then avoided thoroughly cutting off the power supply after display screen and the electric wire netting disconnection to lead to can't providing the problem of predetermineeing voltage for the lamp pearl.
Example 2
According to an embodiment of the present invention, an embodiment of a driving circuit of a display panel is provided, and the driving circuit in this embodiment may perform the driving method of the display panel in embodiment 1, which is not described herein again. Fig. 4 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present application, which is shown in fig. 4 and includes:
the plurality of power supply channels comprise a first power supply channel 41 and a second power supply channel 42, the first power supply channel is used for providing working voltage for the lamp beads, the second power supply channel is used for providing preset voltage for at least one lamp bead, and the preset voltage is smaller than the working voltage;
the switch 43 is arranged between one pole of at least one lamp bead of the display screen and the plurality of power supply channels;
and the controller 44 is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the lamp beads.
Specifically, including the lamp pearl in the above-mentioned display screen, the connected mode of above-mentioned two supply channel is the same, and for the LED of common anode, supply channel sets up between the negative pole of lamp pearl and ground (the connected mode that is shown in fig. 4 to be common anode), and for common cathode channel, supply channel sets up between the positive pole of power and lamp pearl, and the negative pole of lamp pearl is ground jointly. The difference is that the supply voltage of the supply channels is different, which is provided by the drive controller. Each power channel includes a contact to allow conduction of its channel when the switch is closed.
It should be noted that the display screen may further include a battery, and when the display screen is powered off, the battery supplies power to the display screen. Because the power consumption of the display screen in the moisture-proof mode is smaller, the common battery can support the display screen to start the second power supply channel for moisture protection in a longer time.
Above-mentioned scheme is through setting up the switch to control the switch through the controller, thereby can switch between first power supply channel and second power supply channel, not only can satisfy the demand that the display screen normally worked, can also reach damp-proofing effect, solved among the prior art LED display screen and wet the technical problem that leads to LED lamp pearl to break down easily under the condition of not using for a long time.
As an alternative embodiment, the controller comprises: the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel; and the driving controller is used for controlling the power supply voltages of the plurality of power supply channels.
Above-mentioned scheme passes through control register and controls the switch to can switch between first power supply channel and second power supply channel, and supply voltage through a plurality of power supply channel of drive controller control, thereby provide different voltages for the lamp pearl through first power supply channel and second power supply channel, and then not only can satisfy the demand that the display screen normally worked, can also reach damp-proofing effect.
As an alternative embodiment, the second power supply channel comprises: and each power supply sub-channel corresponds to different preset voltage.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, the second power supply channel for providing the dampproofing preset voltage of using for the lamp pearl includes a plurality of power supply electron channels, and each power supply electron channel corresponds to different preset voltage to can predetermine the voltage according to the present required target and select different sub power supply channel.
In an alternative embodiment, fig. 2 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the scheme is described with reference to fig. 2 in this example by using a connection manner in which a lamp bead is a common anode. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for being connected into different contacts through control, so that the lamp beads are connected into different power supply channels. The power supply channel comprises a working channel (namely the first power supply channel) and a micro current channel 1, a micro current channel 2 and a micro current channel 3 (namely the plurality of sub power supply channels, in the embodiment, three sub power supply channels are taken as an example for explanation), the switch is controlled by the control register, when the display screen normally works, the switch is connected to the working channel, the constant current selection driving controller provides working voltage corresponding to the lamp beads for the lamp beads, when the display screen enters a damp-proof mode, the control register determines target preset voltage according to the environment humidity, and the control switch is connected to at least one of the three micro current channels according to the target preset voltage.
To be more specific, for example, the preset voltage corresponding to the micro current channel 1 is 0.1, the preset voltage corresponding to the micro current channel 2 is 0.4, and the preset voltage corresponding to the micro current channel 3 is 0.7. If the preset target voltage determined by the control register according to the current humidity is 0.4, the control register is connected to the micro-current channel 2 to provide corresponding voltage for the lamp beads.
As an optional embodiment, the second power supply channel is a power supply channel, and the driving controller is further connected to the control register, wherein the control register outputs a currently required target preset voltage to the driving controller, and the driving controller supplies power to the lamp bead through the second power supply channel according to the target preset voltage.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, only one second power supply channel for providing damp-proof preset voltage for the lamp beads is provided, but the preset voltage output by the power supply channel can be continuously controlled through the control register.
In an alternative embodiment, fig. 3 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the example still uses a connection mode in which a lamp bead is a common anode to describe the above scheme with reference to fig. 3. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for accessing different contacts, so that the lamp beads are accessed into different power supply channels. The power supply channel comprises a working channel (namely the first power supply channel) and a current-converting micro-current channel (namely the second power supply channel), the switch receives control of the control register, the working channel is connected when the display screen works normally, the constant-current selection drive controller provides working voltage corresponding to the lamp beads for the lamp beads, the current-converting micro-current channel is connected when the display screen enters a damp-proof mode, the control register determines target preset voltage according to environmental humidity and outputs the target preset voltage to the constant-current selection drive controller, and the constant-current selection drive controller outputs corresponding voltage to the lamp beads.
For example, if the preset target voltage determined by the control register according to the current humidity is 0.4, the control switch is connected to the variable current micro-current channel and outputs the determined target preset voltage to the constant current selection drive controller, and the constant current selection drive controller can supply power to the lamp bead according to the target preset voltage.
As an optional embodiment, the driving circuit further includes a timer, the timer is further configured to record a duration that the display screen is in the off state, and the control register is further configured to control the switch to select the second power supply channel when the duration is greater than a preset duration.
When the display screen is in the off state, the time length is longer than the preset time length, which indicates that the time length when the lamp bead of the display screen is not started is up to the preset time length, so that the lamp bead is easily affected by the environmental humidity, and is affected by damp. Under this kind of condition, supply power for the lamp pearl according to predetermineeing voltage to make the lamp pearl can generate heat, and then play damp-proof effect.
As an alternative embodiment, the control register is further arranged to determine whether the display screen is in the off state by detecting whether the main memory of the display screen is refreshed.
In an alternative embodiment, the control register may determine whether data in the RAM is refreshed or not by detecting a check bit in the RAM of the display screen, and further determine whether the display screen is turned on or not, and if data in all the RAMs in the display screen is not refreshed, it is determined that the display screen is in a turned-off state and is not turned on, and if data in any one of the RAMs in the display screen is refreshed, it is determined that the display screen is turned on. The driving circuit can be provided with a timer, the timer starts timing after the display screen is closed, the display screen keeps timing when being in a closed state, and the timing is stopped when the display screen is opened so as to obtain the duration of the display screen when being in the closed state.
It should be noted that the power supply of the display screen can be switched, but the switching of the power supply does not affect the timing of the duration of the display screen being in the off state. For example, the display screen is connected to a 220V power grid when not powered off, and is connected to a backup battery in case of power off. The display screen is not powered off after being closed, the timer starts timing after the display screen is closed, at a certain moment after the display screen is closed, the worker powers off the display screen, the display screen is switched to be powered by the battery, however, as long as the display screen is not restarted, namely, the lamp beads of the display screen are not lightened again, the timer does not interrupt or count again, but continues timing.
As an optional embodiment, the current that second power supply channel provided for the lamp pearl is 0.1 ~ 0.4 uA.
As an optional embodiment, the plurality of electron supply channels are three electron supply channels, and currents provided by the three electron supply channels for the lamp beads are 0.1uA, 0.2uA and 0.3uA respectively.
As an optional embodiment, the preset voltage corresponding to the red chip of the lamp bead is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
As an optional embodiment, the preset voltage corresponding to the green chip of the lamp bead is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
As an optional embodiment, the preset voltage corresponding to the blue chip of the lamp bead is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
Example 3
According to an embodiment of the present invention, an embodiment of a driving method of a display panel is provided, and fig. 5 is a flowchart of the driving method of the display panel according to the embodiment of the present application, as shown in fig. 5, the method includes the following steps:
step S502, when the display screen is in a closed state, the display module of the display screen is powered according to a preset voltage, wherein the preset voltage is smaller than the working voltage of the display module.
The Display screen may be an LCD (Liquid Crystal Display), and the Display module may include at least one of a Display panel and a backlight module.
Because a RAM (Random Access Memory) is arranged on a control card of the display screen and is used for directly exchanging data with a control chip on the control card of the display screen to control the display screen to display images, when the display screen is in a closed state, the data of all the RAMs in the display screen are not refreshed, and at the moment, the display screen is not bright and does not have power consumption, and the display screen is connected with a power supply but does not display images. When the data of all the RAMs in the display screen is not refreshed any more, in the present embodiment, the check bits in the RAMs are the designated data, and therefore, when the check bits read by the control register into the RAMs are the designated data, it is determined that the data of all the RAMs in the display screen is not refreshed any more, and the display screen is in the off state. It can be understood that when the display screen is in the off state, the data in the RAM of the display screen is not refreshed any more, or the RAM of the display screen is detected to be in the power-off state.
The working voltage of the display module is used for representing the voltage which can enable the display module to normally operate, the preset voltage is smaller than the voltage of the working voltage, and the preset voltage is not enough to drive the display module to normally operate.
After the preset voltage is provided for the display module, the current corresponding to the preset voltage can be generated, the display module is difficult to work normally due to the fact that the preset voltage is smaller than the working voltage of the display module, and correspondingly, the current generated by the preset voltage is weak, and the display module is difficult to work normally.
The preset voltage is smaller than the working voltage of the display module, so that when the display module is powered according to the preset voltage, the display module is not driven to normally work, but the preset voltage is converted into micro heat energy inside the display module, and the display module is enabled not to be damped. Because predetermine the voltage and can not drive display module assembly normal work, nevertheless can make display module assembly give off the heat, therefore can play dampproofing effect. And when playing dampproofing effect, because predetermine the voltage less, consequently can not consume too high power.
It should be noted that the display module of this embodiment may be all the display modules of the display screen, or some of the display modules. The power supply for the display modules of the display screen according to the preset voltage can be unified power supply for all the display modules, can also be respectively power supply for different display modules, can also be power supply for only part of the display modules, and the preset voltage for supplying power for all the display modules can be the same or different; the display module of the display screen can be supplied with power according to the preset voltage, or can be supplied with power for a single display module respectively, and the preset voltage of each display module can be the same or different.
Therefore, in the above embodiment of the present application, when the display screen is in the off state, the display module of the display screen is powered according to the preset voltage, wherein the preset voltage is smaller than the working voltage of the display module. Above-mentioned scheme is through supplying power for display module assembly according to the voltage of predetermineeing that is less than operating voltage under the circumstances that the display screen was closed to can make display module assembly generate heat through faint electric current when not driving display module assembly normal operating a little, and then reach damp-proofing effect through generating heat of display module assembly, solved among the prior art display screen and wet the technical problem that leads to the display screen trouble easily under the circumstances of not using for a long time.
Example 4
According to the embodiment of the invention, the display screen comprises a plurality of display modules, and the display modules of the display screen are powered according to the preset voltage when the display screen is in the closed state, wherein the preset voltage is smaller than the working voltage of the display modules.
The display screen in this implementation can execute the driving method of the display screen in embodiment 3, and when the display screen is in an off state, the display module of the display screen is powered according to a preset voltage, where the preset voltage is less than a working voltage of the display module.
When the display screen is in a closed state, data of all the RAMs in the display screen are not refreshed any more, the display screen is not bright at the moment, power consumption does not exist, and the display screen is connected with a power supply but does not display pictures. When the data of all the RAMs in the display screen are not refreshed any more, the check bits in the RAMs are designated data, and therefore when the check bits read by the control register into the RAMs are designated data, the data of all the RAMs in the display screen are determined not to be refreshed any more, and the display screen is in a closed state.
It should be noted that, in the embodiment of the present invention, when the display screen is in the off state, the display screen is powered according to the preset voltage, where the preset voltage is smaller than the operating voltage of the display screen (the lamp bead), which may be embodied that when the display screen is in the off state, the display screen is not lighted, but the temperature of the display screen may be detected to be higher than the temperature of the display screen after the display screen is normally cooled, for example, the external temperature, within a period of time.
It should be noted that the display module of this embodiment may be all the display modules of the display screen, or some of the display modules. The power supply for the display modules of the display screen according to the preset voltage can be unified power supply for all the display modules, can also be respectively power supply for different display modules, can also be power supply for only part of the display modules, and the preset voltage for supplying power for all the display modules can be the same or different; the display module of the display screen can be supplied with power according to the preset voltage, or can be supplied with power for a single display module respectively, and the preset voltage of each display module can be the same or different.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (22)
1. A method of driving a display panel, comprising:
when the display screen is in a closed state, the lamp beads of the display screen are powered according to a preset voltage, wherein the preset voltage is smaller than the working voltage of the lamp beads.
2. The method of claim 1, wherein before powering the lamp bead of the display screen at the preset voltage, the method further comprises:
detecting the duration of the display screen in the closed state continuously;
and under the condition that the duration is greater than the preset duration, the step of supplying power to the lamp beads of the display screen according to the preset voltage is carried out.
3. The method of claim 1, wherein in the closed state of the display screen, the method further comprises:
acquiring humidity information of the environment where the display screen is located;
determining a power supply parameter for supplying power to the lamp bead according to the humidity information, wherein the power supply parameter comprises at least one of the following items: power supply cycle and power supply duration;
and supplying power to the lamp beads of the display screen according to the preset voltage and the power supply parameters.
4. The method of claim 1, wherein the supplying power to the lamp beads of the display screen according to the preset voltage comprises: and controlling a switch to be switched on to provide a power supply channel of the preset voltage for the lamp bead so as to supply power to the lamp bead according to the preset voltage.
5. The method of claim 4, wherein the lamp beads are powered according to the preset voltage, further comprising:
determining a currently required target preset voltage;
and controlling a power supply electronic channel corresponding to the target preset voltage in the power supply channel to be switched on so as to supply power to the lamp bead according to the target preset voltage.
6. The method of claim 4, wherein the lamp beads are powered according to the preset voltage, further comprising:
determining a currently required target preset voltage;
and outputting the target preset voltage to a driving controller so as to control the driving controller to output the target preset voltage to the lamp bead.
7. The method of claim 5 or 6, wherein the determining the currently required target preset voltage comprises:
acquiring humidity information of the environment where the display screen is located;
and determining the target preset voltage according to the humidity information.
8. The method of claim 1, wherein in the closed state of the display screen, the method further comprises: and reducing the frame frequency of the display screen.
9. The method of claim 1, wherein the display screen is powered by a power grid, and during the process of powering the lamp bead of the display screen according to the preset voltage, the method further comprises:
detecting whether the display screen is disconnected with the power grid or not;
and if the display screen is disconnected with the power grid, controlling the display screen to be switched to be supplied with power by a battery.
10. A driving circuit of a display panel, comprising:
the lamp beads are connected with the first power supply channel through the first power supply channel, the second power supply channel is connected with the second power supply channel through the second power supply channel, and the first power supply channel and the second power supply channel are connected with the lamp beads through the second power supply channel;
the switch is arranged between one pole of at least one lamp bead of the display screen and the plurality of power supply channels;
and the controller is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the lamp beads.
11. The circuit of claim 10, wherein the controller comprises:
the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel;
a drive controller for controlling supply voltages of the plurality of supply channels.
12. The circuit of claim 10, wherein the second power channel comprises:
and each power supply sub-channel corresponds to different preset voltage.
13. The circuit of claim 11, wherein the second power supply channel is one power supply channel,
the driving controller is further connected with the control register, the control register outputs a current required target preset voltage to the driving controller, and the driving controller supplies power to the lamp beads through the second power supply channel according to the target preset voltage.
14. The circuit of claim 11, wherein the driving circuit further comprises a timer, the timer is further configured to record a duration of the display screen in the off state, and the control register is further configured to control the switch to select the second power channel if the duration is greater than a preset duration.
15. The circuit of claim 14, wherein the control register is further configured to determine whether the display screen is in an off state by detecting whether a main memory of the display screen is refreshed.
16. The circuit of claim 10, wherein the second power supply channel supplies the lamp bead with a current of 0.1-0.4 uA.
17. The circuit of claim 12, wherein the plurality of electron supply channels are three electron supply channels, and the three electron supply channels supply currents of 0.1uA, 0.2uA and 0.3uA to the lamp beads respectively.
18. The circuit of claim 10, wherein the preset voltage corresponding to the red chip of the lamp bead is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
19. The circuit of claim 10, wherein the preset voltage corresponding to the green chip of the lamp bead is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
20. The circuit of claim 10, wherein the preset voltage corresponding to the blue chip of the lamp bead is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
21. A method of driving a display panel, comprising:
when the display screen is in a closed state, the display module of the display screen is powered according to a preset voltage, wherein the preset voltage is smaller than the working voltage of the display module.
22. The utility model provides a display screen, the display screen includes a plurality of display module assembly, its characterized in that the display screen is in the off-state, does according to predetermineeing the voltage the display module assembly power supply of display screen, wherein, predetermineeing the voltage and be less than the operating voltage of display module assembly.
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| PCT/CN2020/139923 WO2021136143A1 (en) | 2020-01-02 | 2020-12-28 | Display screen driving method and driving circuit, and display screen |
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| WO2021136143A1 (en) * | 2020-01-02 | 2021-07-08 | 广州视源电子科技股份有限公司 | Display screen driving method and driving circuit, and display screen |
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